CN109482703A - A kind of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method and device - Google Patents
A kind of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method and device Download PDFInfo
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- CN109482703A CN109482703A CN201811620768.3A CN201811620768A CN109482703A CN 109482703 A CN109482703 A CN 109482703A CN 201811620768 A CN201811620768 A CN 201811620768A CN 109482703 A CN109482703 A CN 109482703A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
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Abstract
The invention discloses a kind of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method and devices, regulate and control deformation uniformity by mold partition heating, include the following steps, S1: different heating elements is arranged in the different zones of mold, it carries out therm-param method respectively, realizes that mold big end temperature is lower, the higher differential temperature temperature field of mold small end temperature；S2: according to temperature, diameter, wall thickness and the material property of pipe big end and pipe small end, by calculate design air pressure-loading curve, using the air pressure-loading curve, to pipe inside inject compressed gas, make the deformation synchronous with small end of pipe big end, and obtains essentially identical maximum strain rate.The present invention improves deformation uniformity and forming efficiency, reduces energy consumption.
Description
Technical field
The present invention relates to titanium alloy thin wall component Plastic Forming manufacturing technology fields, more particularly to a kind of big section difference titanium
Alloy pipe fitting differential temperature pneumatic shaping method and device.
Background technique
As the delivery vehicles such as aircraft, rocket, automobile, naval vessel develop to lightweight and high reliability, there is an urgent need to use
Titanium alloy manufactures various hollow thin-wall parts, such as aircraft fuel system, aircraft and rocket engine intake and exhaust system, automobile
Oil guide pipe, air intake duct, exhaust duct, the exhaust pipes of uses such as exhaust system, marine engine hot-end component etc..Wherein there is a special dictionary
Type component is big section difference titanium alloy pipe fitting, as shown in Figure 1.
Compared with traditional steel material, titanium alloy member, which has, mitigates the advantages such as weight, corrosion-resistant, high temperature resistant, but by
, deformation resilience poor in titanium alloy temperature-room type plasticity is big, high temperature microstructure develops complicated, and there are forming difficulty, dimensional accuracy and the senses of organization
It can control the problems such as difficulty.Titanium alloy big section difference pipe fitting conventional manufacturing process is whole heating gas pressure compacting, basic principle
It is: pipe and mold closed at both ends is put into togerther in heating furnace, forming temperature is heated to, by taking TC4 titanium alloy as an example, need to adds
Heat is to 700-900 DEG C, then to being passed through compressed gas inside pipe, in pipe internal pressurization, so that pipe deformation is reclined external
Mold is configured to big section difference pipe fitting.
There are the following problems for the whole heating pneumatic shaping method of big section difference pipe fitting: pipe is heated to same completely
Temperature, during internal pressure increases, since the biggish position bearing capacity of perimeter is low, the lesser position bearing capacity of perimeter
Height easily causes deformation asynchronous, and drastic deformation preferentially occurs for the larger position of perimeter, leads to component wall unevenness or can not shape.
Summary of the invention
The object of the present invention is to provide a kind of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method and devices, to solve
The above-mentioned problems of the prior art improves deformation uniformity and forming efficiency, reduces energy consumption.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping methods, pass through mold partition heating tune
Deformation uniformity is controlled, is included the following steps,
S1: arranging different heating elements in the different zones of mold, carries out therm-param method respectively, realizes mold
Big end temperature is lower, the higher differential temperature temperature field of mold small end temperature；
S2: according to temperature, diameter, wall thickness and the material property of pipe big end and pipe small end, air pressure is designed by calculating
Loading curve, using the air pressure-loading curve, to pipe inside inject compressed gas, make pipe big end it is synchronous with small end deformation,
And obtain essentially identical maximum strain rate.
Preferably, the calculation formula of air pressure-loading curve described in step 2 is
Wherein, p (T) is required forming pressure under conditions of temperature is T, and t is pipe wall thickness, and r is pipe inner radius,
σsIt (T) is the yield strength of pipe under conditions of temperature T.
Preferably, the cross sectional shape of pipe both ends described in step 1 is different, and the pipe is the small taper in the big one end in one end
The section of pipe, the pipe is rounded or oval or polygon.
Preferably, pipe described in step 1 with a thickness of 1mm-6mm, the outer diameter of the pipe or the outer profile of cross section
Full-size is 20mm-3000mm, and the length of the pipe is 100mm-2000mm.
Preferably, blank tube material described in step 1 is titanium alloy, and the titanium alloy includes that nearly α type and alpha+beta type titanium close
Gold.
Preferably, the temperature of pipe small end described in step 1 is 650 DEG C -850 DEG C, and the temperature of the pipe small end is lower than
The phase transition temperature of blank tube material.
Preferably, compressed gas described in step 2 is the pressure of the compressed gas of air or the compressed gas of argon gas or nitrogen
The compressed gas of contracting gas or helium.
Preferably, the section of hollow variable cross-section part obtained in step 2 is rounded or oval or polygon or abnormity,
The axis shape of big section difference part obtained in step 2 is straight line or plane inner curve or space curve.
The present invention also provides a kind of for implementing the big of the big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method
Section difference titanium alloy pipe fitting differential temperature gas pressure compacting device is set gradually including big end formed punch, small end formed punch and from top to bottom
Upper mold water-cooled plate, upper mold thermal insulation board, upper module, lower module, lower die thermal insulation board and lower die water-cooled plate are set in the middle part of the upper module
There is a upper mold subregion thermal insulation board, the middle part of the lower module is equipped with lower die subregion thermal insulation board, on the cope plate and the lower template
It is equipped with heating element and thermocouple, the upper module is equipped with upper cavity, and the lower module is equipped with lower chamber, the epicoele
Body and the lower chamber collectively form shape chamber, and the big end of the big end formed punch and the shape chamber matches, the small end formed punch with
The small end of the shape chamber matches, and the outer sheath of the big end formed punch is equipped with big end formed punch heating coil, and the one of the big end formed punch
End is equipped with big end formed punch thermal insulation board, and the center of big end formed punch is equipped with the air inlet being connected to the shape chamber, the small end formed punch
Outer sheath is equipped with small end formed punch heating coil, and one end of the small end formed punch is equipped with small end formed punch thermal insulation board.
Preferably, the cope plate is divided into big end upper module and small end upper module, institute by the upper mold subregion thermal insulation board
It states lower template and big end lower module and small end lower module, the big end upper module and institute is divided by the lower template subregion thermal insulation board
It states big end lower module to match, the small end upper module and the small end lower module match, and the heating element includes big end
Heating element and small end heating element, the big end heating element are respectively arranged at the big end upper module and the big end lower die
On block, the small end heating element is respectively arranged on the small end upper module and the small end lower module, the thermocouple packet
Big end thermocouple and small end thermocouple are included, the big end thermocouple is set on the big end lower module, the small end thermocouple
It is set on the small end lower module.
The present invention achieves following technical effect compared with the existing technology:
1, by regulating and controlling the Temperature Distribution of mold different zones, it can control the forming temperature in pipe different distortion area, solve
As caused by the difference of pipe section different distortion area shapes nonsynchronous problem when whole heating gas pressure compacting；
It 2, can benefit by the reasonable selection to different zones temperature and the design to the air pressure-loading curve under the conditions of differential temperature
With the combination of temperature and air pressure, make pipe fitting under same gas pressure, realize the nearly homogeneous strain rate shaped of different location,
The uniformity of Thickness Distribution can be improved；
3, it when temperature-differential forming, is needed to carry out local heating and temperature control according to pipe fitting forming, avoids the mistake to pipe big end
Degree heating, or apply excessively high air pressure to pipe big end, to improve forming efficiency, reduce energy consumption.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of big section difference titanium alloy pipe fitting；
Fig. 2 is the structural schematic diagram of big section difference titanium alloy pipe；
Fig. 3 is the structural schematic diagram of big section difference titanium alloy pipe fitting differential temperature gas pressure compacting device of the present invention；
Fig. 4 is the schematic illustration of big section difference titanium alloy pipe fitting differential temperature gas pressure compacting of the present invention；
Fig. 5 is the structural schematic diagram after big section difference titanium alloy pipe fitting of the present invention shapes with lower module；
Wherein: 1- pipe fitting, 2- pipe, 3- upper mold water-cooled plate, 4- upper mold thermal insulation board, 5- big end upper module, 6- big end formed punch
Heating coil, 7- big end formed punch, 8- big end formed punch thermal insulation board, 9- air inlet, 10- big end lower module, 11- big end thermocouple, 12- are big
Hold heating element, 13- lower die water-cooled plate, 14- lower die thermal insulation board, 15- small end heating element, 16- lower die subregion thermal insulation board, 17-
Small end thermocouple, 18- small end lower module, 19- small end formed punch thermal insulation board, 20- small end formed punch, 21- small end formed punch heating coil, 22-
Small end upper module, 23- upper mold subregion thermal insulation board, 24- shape chamber.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art under the premise of not making the creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
In the description of the present invention it is to be appreciated that term " on ", "lower", " left side " and " right side " instruction orientation or position
Relationship is orientation and positional relationship based on the figure, it is only for facilitate the structurally and operationally mode of description, rather than
Indicating or imply signified part must have a particular orientation, with the operation of specific orientation, thus should not be understood as to this
The limitation of invention.
The object of the present invention is to provide a kind of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method and devices, to solve
Problem of the existing technology improves deformation uniformity and forming efficiency, reduces energy consumption.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
It is as Figure 1-Figure 5: to present embodiments provide a kind of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method, lead to
Mold partition heating regulation deformation uniformity is crossed, is included the following steps,
S1: arranging different heating elements in the different zones of mold, carries out therm-param method respectively, realizes mold
Big end temperature is lower, the higher differential temperature temperature field of mold small end temperature；
S2: according to temperature, diameter, wall thickness and the material property of 2 big end of pipe and 2 small end of pipe, gas is designed by calculating
Press loading curve, using the air pressure-loading curve, to pipe 2 inside inject compressed gas, make 2 big end of pipe and 2 small end of pipe
Synchronous deformation, and obtain essentially identical maximum strain rate.
Specifically, 2 both ends cross sectional shape of pipe is different in step 1, and pipe 2 is the small taper pipe in the big one end in one end, pipe
The section of base 2 is preferably rounded or oval or polygon.The thickness of pipe 2 is preferably 1mm-6mm, pipe 2 in step 1
Outer diameter or the outer profile of cross section preferably have a maximum 20mm-3000mm, the length of pipe 2 is preferably 100mm-
2000mm.2 material of pipe in step 1 is preferably titanium alloy, and titanium alloy includes nearly α type and alpha and beta titanium alloy, mainly includes
It is not limited to the following trade mark: TA15, TA18, TC2, TC4, TC11, TC21, TC31, Ti55.The temperature of 2 small end of pipe in step 1
Preferably 650 DEG C -850 DEG C of degree, the temperature of 2 small end of pipe is lower than the phase transition temperature of 2 material of pipe, guarantee big end after forming and
The structural homogenity of small end.
Air pressure-loading curve used by the heating temperature and gas pressure compacting of mold different zones, can be according to 1 material of pipe fitting
The parameters such as the diameter of the mechanical property of different temperatures, wall thickness and different parts are calculated using theory of mechanics and are obtained, can also passed through
Finite element modelling advanced optimizes, when shaping pipe 2 under such temperature field and air pressure loading environment, big end and small end group
This synchronization deformation, and maximum strain rate is essentially identical in deformation process.
Air pressure, the calculating of the air pressure-loading curve in step 2 are shaped needed for 2 different temperatures of pipe and different-diameter position
Formula is
Wherein, p (T) is required forming pressure under conditions of temperature is T, and t is 2 wall thickness of pipe, and r is half on the inside of pipe
Diameter, σsIt (T) is the yield strength of the pipe 2 under conditions of temperature T.
The formula does not consider the progress with deformation process, judgement of speed change caused by the dynamic change of 2 diameter of pipe and wall thickness
Rate variation.If you need to control the strain rate of whole deformation process, need to carry out finite element simulation, and repaired according to certain experiment
Just.
Compressed gas is preferably the compressed gas of the compressed gas of air or the compressed gas of argon gas or nitrogen in step 2
Or the compressed gas of helium.The section of hollow variable cross-section part obtained in step 2 is preferably rounded or oval or polygon
Or it is special-shaped, the axis of big section difference part obtained in step 2 is preferably shaped to straight line or plane inner curve or space curve.
The present embodiment additionally provides a kind of for implementing big section of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method
Face difference titanium alloy pipe fitting differential temperature gas pressure compacting device is set gradually including big end formed punch 7, small end formed punch 8 and from top to bottom
Upper mold water-cooled plate 3, upper mold thermal insulation board 4, upper module, lower module, lower die thermal insulation board 14 and lower die water-cooled plate 13, the middle part of upper module
Equipped with upper mold subregion thermal insulation board 23, the middle part of lower module is equipped with lower die subregion thermal insulation board 16, is equipped in cope plate and lower template
Heating element and thermocouple, upper module are equipped with upper cavity, and lower module is equipped with lower chamber, and upper cavity and lower chamber collectively form
Shape chamber 24, big end formed punch 7 and the big end of shape chamber 24 match, and small end formed punch 20 and the small end of shape chamber 24 match, big end formed punch 7
Outer sheath be equipped with big end formed punch heating coil 6, one end of big end formed punch 7 is equipped with big end formed punch thermal insulation board 8, in big end formed punch 7
The heart is equipped with the air inlet 9 being connected to shape chamber 24, and the outer sheath of small end formed punch 20 is equipped with small end formed punch heating coil 21, small end formed punch 20
One end be equipped with small end formed punch thermal insulation board 19.
Specifically, cope plate is divided by upper mold subregion thermal insulation board 23 for big end upper module 5 and small end upper module 22, lower template
Divided by lower template subregion thermal insulation board 16 for big end lower module 10 and small end lower module 18, big end upper module 5 and big end lower module
10 match, and small end upper module 22 and small end lower module 18 match, and heating element includes that big end heating element 12 and small end add
Big end heating element 12 is equipped on thermal element 15, big end upper module 5 and big end lower module 10, under small end upper module 22 and small end
Small end heating element 15 is equipped in module 18, thermocouple includes big end thermocouple 11 and small end thermocouple 17, big end thermocouple
11 are set on big end lower module 10, and small end thermocouple 17 is set on small end lower module 18.
It is the titanium alloy big section difference pipe fitting of straight line for axis, differential temperature pneumatic shaping method is specifically according to the following steps
It completes:
(1) mold partition heating and axial-temperature gradient control.In order to realize that partition heating, shaping dies are divided into four
Major part: big end upper module 5, big end lower module 10 and small end lower module 18, small end upper module 22.In order to reduce mold heat
Loss installs upper mold thermal insulation board 4 and lower die thermal insulation board 14 in mold respectively up and down, while in order to prevent heat to the shadow of press machine
It rings, upper mold water-cooled plate 3 and lower die water-cooled plate 13 is installed respectively in the outer layer of upper mold thermal insulation board 4 and lower die thermal insulation board 1.Mold not
Different heating elements is arranged with region, specifically, small end heating unit is installed on small end upper module 22 and small end lower module 18
Part 15, on big end upper module 5 and big end lower module 10 install big end heating element 12, mold big end upper module 5 and under
Upper mold subregion thermal insulation board 23 is added between the upper module 22 of end, lower die point is added between big end lower module 10 and small end lower module 18
Hot plate 16 is separated, both ends heat transfer is reduced；Then big end thermocouple 11 is set on big end lower module 10 respectively, under small end
Small end thermocouple 17 is installed in module 18, carries out big end upper module 5 and big end lower module 10 and small end upper module 22 and small respectively
Hold the therm-param method of lower module 18, so that it may mold different zones are heated to different temperatures, i.e., by the temperature of pipe big end
Degree is heated to T1, the temperature of pipe small end is heated to T2, and T2 > T1, big end temperature is lower, small end temperature is higher to obtain
Temperature field, it is specific as shown in Figure 4.While the temperature in order to guarantee big end formed punch 7 and small end formed punch 20, respectively in big end formed punch
7 and the outside of small end formed punch 20 be arranged big end formed punch heating coil 6 and small end formed punch heating coil 21, big end formed punch 7 and small end respectively
Big end formed punch thermal insulation board 8 and small end formed punch thermal insulation board 19 are installed in one end of formed punch 20 respectively, to reduce big end formed punch 7 and small end punching
First 20 thermal loss.
(2) gas pressure compacting.After mold different zones obtain set temperature field, first with big end formed punch 7 and small end formed punch
20 seal the both ends of pipe 2, then compressed gas is rapidly injected pipe 2 by air inlet 9 according to the air pressure-loading curve of design
Inside makes pipe dilatancy under the action of air pressure p, and recline mold, obtains big section difference pipe fitting, specific as shown in Figure 5.
By taking TC4 titanium alloy pipe as an example, in strain rate 0.01s-1Under the conditions of, the peak flow stress of different temperatures is such as
Shown in table 1.
1 TC4 titanium alloy peak flow stress (strain rate 0.01s of table-1)
| Deformation temperature/DEG C | Peak flow stress/MPa |
| 700 | 354 |
| 800 | 171 |
For TC4 titanium alloy pipe, when 2 wall thickness of pipe is 2mm, 2 big end radius of pipe is 200mm, 2 small end radius of pipe
When for 100mm, if 2 big end temperature of pipe is 700 DEG C, (peak flow stress 354MPa), according to the meter of air pressure-loading curve
Formula estimation is calculated, air pressure needed for shaping is 3.54MPa.Under the air pressure, if enabling 2 small end of pipe and 2 big end of pipe
Synchronous deformation estimates that the peak flow stress of 2 small end of pipe should be lower than still according to the calculation formula of air pressure-loading curve
177MPa, according to table 1, the peak flow stress data of TC4 titanium alloy different temperatures at this time such as heats 2 small end of pipe
To 800 DEG C, then 2 small end peak flow stress of pipe can be made to be down to 171MPa, to meet 2 small end deformation condition of pipe.
It is 700 DEG C in the temperature of 2 big end of pipe, under the conditions of the differential temperature that 2 small end temperature of pipe is 800 DEG C, uses
The big end deformation synchronous with small end of the big section difference pipe fitting then may be implemented in 3.54MPa air pressure.
The present embodiment can control the forming temperature in 2 different distortion area of pipe by the Temperature Distribution of regulation mold different zones
Degree solves the problems, such as that the forming of the different distortion area as caused by 2 section difference of pipe is nonsynchronous when whole heating gas pressure compacting；
By the reasonable selection to different zones temperature and the design to the air pressure-loading curve under the conditions of differential temperature, using temperature and gas
The combination of pressure makes pipe fitting 1 under same gas pressure, realizes the nearly homogeneous strain rate shaped of different location, wall can be improved
The uniformity of thickness distribution；It when temperature-differential forming, needs to carry out local heating and temperature control according to the forming of pipe fitting 1, avoid big to pipe 2
The excessive heating at end, or excessively high air pressure is applied to 2 big end of pipe, to improve forming efficiency, reduce energy consumption.
Apply that a specific example illustrates the principle and implementation of the invention in this specification, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (10)
1. a kind of big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method, it is characterised in that: regulated and controled by mold partition heating
Deformation uniformity includes the following steps,
S1: arranging different heating elements in the different zones of mold, carries out therm-param method respectively, realizes mold big end
Temperature is lower, the higher differential temperature temperature field of mold small end temperature；
S2: according to temperature, diameter, wall thickness and the material property of pipe big end and pipe small end, air pressure-loading is designed by calculating
Curve, using the air pressure-loading curve, to pipe inside inject compressed gas, make the deformation synchronous with small end of pipe big end, and obtain
Obtain essentially identical maximum strain rate.
2. big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method according to claim 1, it is characterised in that: step 2
Described in the calculation formula of air pressure-loading curve be
Wherein, p (T) is required forming pressure under conditions of temperature is T, and t is pipe wall thickness, and r is pipe inner radius, σs(T)
For the yield strength of pipe under conditions of temperature T.
3. big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method according to claim 1, it is characterised in that: step 1
Described in pipe both ends cross sectional shapes it is different, the pipe is the small taper pipe in the big one end in one end, and the section of the pipe is in
Round or ellipse or polygon.
4. big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method according to claim 1, it is characterised in that: step 1
Described in pipe with a thickness of 1mm-6mm, the outer diameter of the pipe or the outer profile full-size of cross section are 20mm-
3000mm, the length of the pipe are 100mm-2000mm.
5. big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method according to claim 1, it is characterised in that: step 1
Described in blank tube material be titanium alloy, the titanium alloy includes nearly α type and alpha and beta titanium alloy.
6. big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method according to claim 1, it is characterised in that: step 1
Described in the temperature of pipe small end be 650 DEG C -850 DEG C, the temperature of the pipe small end is lower than the phase transition temperature of blank tube material.
7. big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method according to claim 1, it is characterised in that: step 2
Described in compressed gas be air compressed gas or argon gas compressed gas nitrogen compressed gas or helium compressed gas
Body.
8. big section difference titanium alloy pipe fitting differential temperature pneumatic shaping method according to claim 1, it is characterised in that: step 2
Obtained in hollow variable cross-section part section is rounded or oval or polygon or abnormity, big section difference obtained in step 2
The axis shape of part is straight line or plane inner curve or space curve.
9. a kind of big section difference titanium alloy pipe fitting differential temperature gas pressure compacting for implementing as described in any one of claim 1-8
The big section difference titanium alloy pipe fitting differential temperature gas pressure compacting device of method, it is characterised in that: including big end formed punch, small end formed punch and
Upper mold water-cooled plate, upper mold thermal insulation board, upper module, lower module, lower die thermal insulation board and the lower die water-cooled plate set gradually from top to bottom,
The middle part of the upper module is equipped with upper mold subregion thermal insulation board, and the middle part of the lower module is equipped with lower die subregion thermal insulation board, it is described on
It is equipped with heating element and thermocouple in module and the lower template, the upper module is equipped with upper cavity, on the lower module
Equipped with lower chamber, the upper cavity and the lower chamber collectively form shape chamber, the big end phase of the big end formed punch and the shape chamber
Matching, the small end of the small end formed punch and the shape chamber match, and the outer sheath of the big end formed punch is heated equipped with big end formed punch
Circle, one end of the big end formed punch are equipped with big end formed punch thermal insulation board, the center of big end formed punch be equipped be connected to the shape chamber into
Stomata, the outer sheath of the small end formed punch are equipped with small end formed punch heating coil, one end of the small end formed punch be equipped with small end formed punch every
Hot plate.
10. big section difference titanium alloy pipe fitting differential temperature gas pressure compacting device according to claim 9, it is characterised in that: described
Cope plate is divided into big end upper module and small end upper module by the upper mold subregion thermal insulation board, and the lower template passes through the lower die
Plate subregion thermal insulation board is divided into big end lower module and small end lower module, and the big end upper module matches with the big end lower module,
The small end upper module and the small end lower module match, and the heating element includes big end heating element and small end heating unit
Part, the big end heating element are respectively arranged on the big end upper module and the big end lower module, the small end heating unit
Part is respectively arranged on the small end upper module and the small end lower module, and the thermocouple includes big end thermocouple and small end heat
Galvanic couple, the big end thermocouple are set on the big end lower module, and the small end thermocouple is set to the small end lower module
On.
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| CN201811620768.3A CN109482703B (en) | 2018-12-28 | 2018-12-28 | Differential temperature and air pressure forming method and device for large-section-difference titanium alloy pipe fitting |
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| CN201811620768.3A CN109482703B (en) | 2018-12-28 | 2018-12-28 | Differential temperature and air pressure forming method and device for large-section-difference titanium alloy pipe fitting |
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| CN111558645A (en) * | 2020-07-15 | 2020-08-21 | 天津天锻航空科技有限公司 | Method and device for forming part by conical rubber cylinder |
| CN112570579A (en) * | 2020-11-25 | 2021-03-30 | 南昌航空大学 | Forming device and method for realizing pipe end necking thickening by accurately controlling temperature in different areas |
| CN112642916A (en) * | 2020-12-01 | 2021-04-13 | 北京星航机电装备有限公司 | Integrated forming die and forming method for large-reducing-ratio special-shaped titanium alloy thin-wall part |
| CN112935729A (en) * | 2021-02-23 | 2021-06-11 | 哈尔滨工业大学 | Uniformity control method for large-diameter-variable double-cone part during superplastic forming |
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| CN112935729A (en) * | 2021-02-23 | 2021-06-11 | 哈尔滨工业大学 | Uniformity control method for large-diameter-variable double-cone part during superplastic forming |
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